C8051F531-ITR Silicon Labs, C8051F531-ITR Datasheet - Page 166
C8051F531-ITR
Manufacturer Part Number
C8051F531-ITR
Description
8-bit Microcontrollers - MCU 8KB 12ADC 125C 20Pin MCU
Manufacturer
Silicon Labs
Datasheet
1.C8051F536-ITR.pdf
(220 pages)
Specifications of C8051F531-ITR
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
8 KB
Data Ram Size
256 B
On-chip Adc
Yes
Package / Case
TSSOP-20
Mounting Style
SMD/SMT
A/d Bit Size
12 bit
A/d Channels Available
16
Interface Type
SPI, UART
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
16
Number Of Timers
3
On-chip Dac
No
Processor Series
C8051
Program Memory Type
Flash
Factory Pack Quantity
2500
Supply Voltage - Max
2.7 V, 5.25 V
Supply Voltage - Min
2 V, 2.7 V
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C8051F52x/F53x
Important: The minimum system clock (SYSCLK) to operate the LIN peripheral is 8 MHz.
Use the following equations to calculate the values for the variables for the baud-rate equation:
It is important to note that in all these equations, the results must be rounded down to the nearest integer.
The following example shows the steps for calculating the baud rate values for a Master node running at
24.5 MHz and communicating at 19200 bits/sec. First, calculate the multiplier:
Next, calculate the prescaler:
Finally, calculate the divider:
These values lead to the following baud rate:
166
prescaler
prescaler
divider
divider
Table 17.1. Baud-Rate Calculation Variable Ranges
baud_rate
=
=
multiplier
=
ln
=
------------------------------------------------------------------------------------------------------------------- -
2
ln
prescaler
------------------------------------------------------------ -
2
multiplier
----------------------------------------------------------------------------------------- -
multiplier
prescaler
Factor
divider
multiplier
-----------------------------------------------------
1
0
+
=
+
1
------------------------------------------------------ -
2
1
24500000
+
24500000
1
=
1
+
0
1
20000
-------------- - 1
19200
19200 200
+
Rev. 1.4
24500000
=
+
1
SYSCLK
multiplier
1
-------------------------- - 1
baud_rate
0
baud_rate 200
SYSCLK
+
20000
–
19200
1
200…511
Range
=
0…31
0…3
0.0417 0
319
+
=
------- - 1
ln2
–
1
1
319.010 319
–
19200.63
baud_rate
=
1.674
------- - 1
ln2
1
1
–
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